Figure 6.

The effect of film thickness on the local variation of T_g and fragility. (a) T dependence of the relaxation time τ_s for representative distances from the surface for h_g = 7.76. We observe that there is a rapid increase of τ_s near the attractive surface, consistent with an increase of fragility at the attractive surface. (b) T_g and (c) fragility as a function of distance z from the wall. The region closest to the attractive wall has a locally increased T_g, resulting from an increasing fragility near the wall. Hence, the high fragility near the supporting surface has a large effect on the overall film dynamics.